﻿// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Castle.DynamicProxy.Contributors
{
	using Castle.DynamicProxy.Generators;
	using Castle.DynamicProxy.Generators.Emitters;
	using Castle.DynamicProxy.Generators.Emitters.SimpleAST;

	public class ForwardingMethodGenerator : MethodGenerator
	{
		private readonly GetTargetReferenceDelegate getTargetReference;

		public ForwardingMethodGenerator(MetaMethod method, OverrideMethodDelegate overrideMethod,
		                                 GetTargetReferenceDelegate getTargetReference)
			: base(method, overrideMethod)
		{
			this.getTargetReference = getTargetReference;
		}

		protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class,
		                                                        ProxyGenerationOptions options, INamingScope namingScope)
		{
			var targetReference = getTargetReference(@class, MethodToOverride);
			var arguments = ArgumentsUtil.ConvertToArgumentReferenceExpression(MethodToOverride.GetParameters());

			emitter.CodeBuilder.AddStatement(new ReturnStatement(
			                                 	new MethodInvocationExpression(
			                                 		targetReference,
			                                 		MethodToOverride,
			                                 		arguments) { VirtualCall = true }));
			return emitter;
		}
	}
}